Everyone who is building this may consider a full 19" width front panel - IMO horizontal 19" panels work well together with vertical MOTM modules, and probably with other vertical modules as well.

Just an idea.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Everyone who is building this may consider a full 19" width front panel - IMO horizontal 19" panels work well together with vertical MOTM modules, and probably with other vertical modules as well.

Just an idea.

JH.

Hmmmm... My cabinets are 24U wide, so I would have to mount the modules on a hanging rack below the table with the racks. Not too keen on that. At the same time, I lack Dave Brown's prowess with a drill and just about any tool.

I'm going to go with a wide panel. At some point I'm going to have to come to terms with the idea that the modular is going to need a lower table (and another cabinet) if I'm going to be working ergonomically.

Does anyone else here think that this demands a Yusynth fixed filter bank with individual band breakouts?

I've got my scanner powered up (I had the bridge rectifier soldered in the wrong way) and control over the led's is working but I'm not getting any audio. I've got a drum machine's output plugged in to input 1 and the output connected to my mixer. Should I be able to hear audio with this connection?
-Clay

I've got my scanner powered up (I had the bridge rectifier soldered in the wrong way) and control over the led's is working but I'm not getting any audio. I've got a drum machine's output plugged in to input 1 and the output connected to my mixer. Should I be able to hear audio with this connection?
-Clay

Yes - if, and only if, the LED for input 1 is glowing.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Ooops, I just realized I haven't grounded my inputs! What is the best way to ground all 9 inputs? And what do you recommend grounding them to?
-Clay

Connect them to the GND pin of one of the on-board connectors. GND pin of the output connector would be a good choice.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Connect them to the GND pin of one of the on-board connectors. GND pin of the output connector would be a good choice.

Done. I can now hear the signal being fed into input 1 through the output! But changing the position of the LED has no effect. I hear the dry signal from input 1 no matter where I move the LED position. Any ideas?
-Clay

Connect them to the GND pin of one of the on-board connectors. GND pin of the output connector would be a good choice.

Done. I can now hear the signal being fed into input 1 through the output! But changing the position of the LED has no effect. I hear the dry signal from input 1 no matter where I move the LED position. Any ideas?
-Clay

Normalized to previous jacks?

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Well, then the answer is obvious: If you have normalized input N+1 to input N, you have the signal of input 1 on all the other inputs, as long as you don't plug anything else into another input jack ...

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

you have the signal of input 1 on all the other inputs, as long as you don't plug anything else into another input jack ...

JH.

I'm thinking the scanner is working properly but I don't know how to use it! Jurgen, could you explaine how you set up the scanner for the sound clip on your site that uses the Scan CV Input as the audio source? I think I could figure out how everything works if I had a working set-up to start with.
Thanks for the help!
-Clay

This is where the audio clip example is on your site:
"you can get this by running an audio signal into the Scan CV input!
It's like a waveshaper, but without a waveshaper's static nature".

you have the signal of input 1 on all the other inputs, as long as you don't plug anything else into another input jack ...

JH.

I'm thinking the scanner is working properly but I don't know how to use it! Jurgen, could you explaine how you set up the scanner for the sound clip on your site that uses the Scan CV Input as the audio source? I think I could figure out how everything works if I had a working set-up to start with.
Thanks for the help!
-Clay

This is where the audio clip example is on your site:
"you can get this by running an audio signal into the Scan CV input!
It's like a waveshaper, but without a waveshaper's static nature".

The exact setting is hard to reproduce.
But try this:

Feed Audio into Scan input. (With a pot to adjust level)

Fedd various DC voltages and / or LFO signals to the inputs 1 ... 9.
Then listen to the output for different levels of audio input.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Ok, I'm starting to understand now! It's all about dialing in on something that sounds good and fine tuning from there. I'm getting some pretty raunchy sounds now that I have a better idea what's happening under the hood, thanks Jurgen! Now off to make some noise!
-Clay

Ok, I'm starting to understand now! It's all about dialing in on something that sounds good and fine tuning from there. I'm getting some pretty raunchy sounds now that I have a better idea what's happening under the hood, thanks Jurgen! Now off to make some noise!
-Clay

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Posted: Tue Dec 23, 2008 12:32 am Post subject:
How about a detailed explanation of Interpolating Scanner?Subject description: How does it do what it does?

Hi Jurgen,

I really don't understand the theory of operation - electronically, I mean, (and I don't think I'm the only one). I've read the descriptions you've published, but still don't understand what make the first stage turn off among other things. I've shown it to a couple of engineers and they too scratch their heads.

Posted: Tue Dec 23, 2008 12:59 am Post subject:
Re: How about a detailed explanation of Interpolating ScanneSubject description: How does it do what it does?

riley smith wrote:

Hi Jurgen,

I really don't understand the theory of operation - electronically, I mean, (and I don't think I'm the only one). I've read the descriptions you've published, but still don't understand what make the first stage turn off among other things. I've shown it to a couple of engineers and they too scratch their heads.

If you have the time, I'm sure others would appreciate it as well.

Thanks,

- Riley

Well, if you read my descriptions, you're familiar with the concept (overlapping triangle functions), but not with the implementation. That's because I didn't implement it like I once described it, but used an idea of the brilliant Don Tillman instead. Don, inspired by my first Interpolating Scanner, soon made his own version of it and presented it here: http://www.till.com/articles/scanner/index.html .
So that page will be the missing link for understanding it all.
Don kindly gave me permission to use his idea. I then further modified his circuit, replaced diodes with emitter followers, introduced emitter degradation resistors to linearize the rounded triangles a bit, changed the polarity of the whole circuit (sinks to sources, and vice versa) and shifted the references to negative voltages - in order to use simple transistor pairs as VCAs with GND-referenced signal inputs. Summing all the VCA outputs is done by connecting all the collectors of each side of the 9 variable gain transistor pairs together. I only need the differential amp that converts a long tailed pair into a ready voltage-in / voltage-out VCA once. You can look at it as a discrete VCA (long tailed pair + differential amp) with 9 parallel input stages.

I hope this gives a better understanding. Reading Don's description will be helpful for sure.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Hi Jurgen. I recently finished my interpolating scanner/function generator version and I'm trying to figure out how to fix it. When I turn the scan pot the first LED lights up slightly, then the second, dimmer than the first, then the third, very dim. For the rest of the rotation all the LEDs are dark. When I insert audio into the inputs, it sounds just like you would expect from looking at the LEDs.

I've tried changing all the chips and checked to make sure I read .6-.7v across both junctions of all the transistors when measured with a diode checker. I also measured the output of U13 on pin 1 while I sweep the scan pot. It goes from -4v to 2.7v. I applied an external DC10v and swept the manual pot again and measured 2.1v to 3.5v, but it didn't make any of the LED's light up.

Any idea what's wrong? Also, I noticed that LEDs are an integral part of the circuit and you specified 2mA LEDs and I'm not sure exactly what that means. I used these LED's here:

Hi Jurgen. I recently finished my interpolating scanner/function generator version and I'm trying to figure out how to fix it. When I turn the scan pot the first LED lights up slightly, then the second, dimmer than the first, then the third, very dim. For the rest of the rotation all the LEDs are dark. When I insert audio into the inputs, it sounds just like you would expect from looking at the LEDs.

I've tried changing all the chips and checked to make sure I read .6-.7v across both junctions of all the transistors when measured with a diode checker. I also measured the output of U13 on pin 1 while I sweep the scan pot. It goes from -4v to 2.7v. I applied an external DC10v and swept the manual pot again and measured 2.1v to 3.5v, but it didn't make any of the LED's light up.

Any idea what's wrong? Also, I noticed that LEDs are an integral part of the circuit and you specified 2mA LEDs and I'm not sure exactly what that means. I used these LED's here:

I've also attached a picture of the board. Before anyone asks, there are two places where I had to solder 2 resistors in parallel to get the correct value.

2mA LEDs just means that for the LEDs to light up enough that you see them, they should be of that "low current" (2mA) type. If you's use 10mA or 20mA LEDs, the circuit would still work, but yo'd ony see the LEDs shining in a dark room.

So, the LEDs could not be a problem, except when they are defective (open circuit) or soldered in backwards.

As long as you cannot move the LED dot across all 9 channels, it's useless to check further with audio.

There's a lot of npn (BC550) and pnp (BC560) transistors - any chance that you mixed one up somewhere?

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

iThere's a lot of npn (BC550) and pnp (BC560) transistors - any chance that you mixed one up somewhere?

Unfortunately not. I just triple checked.

Do the voltages I read sound normal, meaning that the problem would be somewhere in the VCA's rather than the control section?_________________" I went through quite a few trannies til I found one I liked" - Wild Zebra

Ok, I found the problem. You were very close. I had a BC560 in place of the TL431 regulator. I didn't read the TL431 text on the board and just put BC560's in any transistor holes that weren't marked for BC550's

Now it's working perfectly There are so many uses for this module, I wish I had three._________________" I went through quite a few trannies til I found one I liked" - Wild Zebra

you can also do a tracking generator within the same module and also use this as a waveshaper.
And its also the same board as the interpolating chorus. you *can* make all functionalitys within one module.

the simpliest patch is to use the Haible scanner as a "preset-VCA / Tremolo.
build two and you have a stereo Tremolo ( the best in the world in my opinion. saying this without knowing analog FX, but knowing LFOs )
alone worth to build two Haible Scanner.
at least it was for me

Ok, I found the problem. You were very close. I had a BC560 in place of the TL431 regulator. I didn't read the TL431 text on the board and just put BC560's in any transistor holes that weren't marked for BC550's

Now it's working perfectly There are so many uses for this module, I wish I had three.

Glad it works now!
I already felt a bit guilty for not providing much help here ... but my PSpice is still down

No problem in selling you two more boards.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

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